HTML Input Attributes | HTML for Junior Classes - Class 3 PDF Download

This chapter describes the different attributes for the HTML <input> element.

The value Attribute

The input value attribute specifies an initial value for an input field:
Example

Input fields with initial (default) values:

<form>

  <label for="fname">First name:</label><br>

  <input type="text" id="fname" name="fname" value="John"><br>

  <label for="lname">Last name:</label><br>

  <input type="text" id="lname" name="lname" value="Doe">

</form>

The Readonly Attribute

The input readonly attribute specifies that an input field is read-only.
A read-only input field cannot be modified (however, a user can tab to it, highlight it, and copy the text from it).
The value of a read-only input field will be sent when submitting the form!
Example

A read-only input field:

<form>

  <label for="fname">First name:</label><br>

  <input type="text" id="fname" name="fname" value="John" readonly><br>

  <label for="lname">Last name:</label><br>

  <input type="text" id="lname" name="lname" value="Doe">

</form>

The Disabled Attribute

The input disabled attribute specifies that an input field should be disabled.
A disabled input field is unusable and un-clickable.
The value of a disabled input field will not be sent when submitting the form!
Example

A disabled input field:

<form>

  <label for="fname">First name:</label><br>

  <input type="text" id="fname" name="fname" value="John" disabled><br>

  <label for="lname">Last name:</label><br>

  <input type="text" id="lname" name="lname" value="Doe">

</form>

The Size Attribute

The input size attribute specifies the visible width, in characters, of an input field.
The default value for size is 20.

Note: The size attribute works with the following input types: text, search, tel, url, email, and password.

Example
Set a width for an input field:

<form>

  <label for="fname">First name:</label><br>

  <input type="text" id="fname" name="fname" size="50"><br>

  <label for="pin">PIN:</label><br>

  <input type="text" id="pin" name="pin" size="4">

</form>

The Maxlength Attribute

The input maxlength attribute specifies the maximum number of characters allowed in an input field.

Note: When a maxlength is set, the input field will not accept more than the specified number of characters. However, this attribute does not provide any feedback. So, if you want to alert the user, you must write JavaScript code.

Example
Set a maximum length for an input field:

<form>

  <label for="fname">First name:</label><br>

  <input type="text" id="fname" name="fname" size="50"><br>

  <label for="pin">PIN:</label><br>

  <input type="text" id="pin" name="pin" maxlength="4" size="4">

</form>

The Min and Max Attributes

The input min and max attributes specify the minimum and maximum values for an input field.
The min and max attributes work with the following input types: number, range, date, datetime-local, month, time and week.

Note: Use the max and min attributes together to create a range of legal values.

Example
Set a max date, a min date, and a range of legal values:

<form>

  <label for="datemax">Enter a date before 1980-01-01:</label>

  <input type="date" id="datemax" name="datemax" max="1979-12-31"><br><br>

  <label for="datemin">Enter a date after 2000-01-01:</label>

  <input type="date" id="datemin" name="datemin" min="2000-01-02"><br><br>

  <label for="quantity">Quantity (between 1 and 5):</label>

  <input type="number" id="quantity" name="quantity" min="1" max="5">

</form>

The multiple Attribute

The input multiple attribute specifies that the user is allowed to enter more than one value in an input field.
The multiple attribute works with the following input types: email, and file.
Example
A file upload field that accepts multiple values:

<form>

  <label for="files">Select files:</label>

  <input type="file" id="files" name="files" multiple>

</form>

The Pattern Attribute

The input pattern attribute specifies a regular expression that the input field's value is checked against, when the form is submitted.
The pattern attribute works with the following input types: text, date, search, url, tel, email, and password.
Tip: Use the global title attribute to describe the pattern to help the user.
Tip: Learn more about regular expressions in our JavaScript tutorial.
Example
An input field that can contain only three letters (no numbers or special characters):

<form>

  <label for="country_code">Country code:</label>

  <input type="text" id="country_code" name="country_code"

  pattern="[A-Za-z]{3}" title="Three letter country code">

</form>

The Placeholder Attribute

The input placeholder attribute specifies a short hint that describes the expected value of an input field (a sample value or a short description of the expected format).
The short hint is displayed in the input field before the user enters a value.
The placeholder attribute works with the following input types: text, search, url, tel, email, and password.
Example
An input field with a placeholder text:

<form>

  <label for="phone">Enter a phone number:</label>

  <input type="tel" id="phone" name="phone"

  placeholder="123-45-678"

  pattern="[0-9]{3}-[0-9]{2}-[0-9]{3}">

</form>

The Required Attribute

The input required attribute specifies that an input field must be filled out before submitting the form.
The required attribute works with the following input types: text, search, url, tel, email, password, date pickers, number, checkbox, radio, and file.
Example
A required input field:

<form>

  <label for="username">Username:</label>

  <input type="text" id="username" name="username" required>

</form>

The Step Attribute

The input step attribute specifies the legal number intervals for an input field.
Example: if step="3", legal numbers could be -3, 0, 3, 6, etc.
Tip: This attribute can be used together with the max and min attributes to create a range of legal values.
The step attribute works with the following input types: number, range, date, datetime-local, month, time and week.
Example
An input field with a specified legal number intervals:

<form>

  <label for="points">Points:</label>

  <input type="number" id="points" name="points" step="3">

</form>

The Autofocus Attribute

The input autofocus attribute specifies that an input field should automatically get focus when the page loads.
Example
Let the "First name" input field automatically get focus when the page loads:

<form>

  <label for="fname">First name:</label><br>

  <input type="text" id="fname" name="fname" autofocus><br>

  <label for="lname">Last name:</label><br>

  <input type="text" id="lname" name="lname">

</form>

The Height and Width Attributes

The input height and width attributes specify the height and width of an <input type="image"> element.
Example
Define an image as the submit button, with height and width attributes:

<form>

  <label for="fname">First name:</label>

  <input type="text" id="fname" name="fname"><br><br>

  <label for="lname">Last name:</label>

  <input type="text" id="lname" name="lname"><br><br>

  <input type="image" src="https://edurev.gumlet.io/mg_submit.gif" alt="Submit" width="48" height="48">

</form>

The list Attribute

The input list attribute refers to a <datalist> element that contains pre-defined options for an <input> element.
Example
An <input> element with pre-defined values in a <datalist>:

<form>

  <input list="browsers">

  <datalist id="browsers">

    <option value="Internet Explorer">

    <option value="Firefox">

    <option value="Chrome">

    <option value="Opera">

    <option value="Safari">

  </datalist>

</form>

The Autocomplete Attribute

The input autocomplete attribute specifies whether a form or an input field should have autocomplete on or off.
Autocomplete allows the browser to predict the value. When a user starts to type in a field, the browser should display options to fill in the field, based on earlier typed values.
The autocomplete attribute works with <form> and the following <input> types: text, search, url, tel, email, password, datepickers, range, and color.
Example
An HTML form with autocomplete on, and off for one input field:

<form action="/action_page.php" autocomplete="on">

  <label for="fname">First name:</label>

  <input type="text" id="fname" name="fname"><br><br>

  <label for="lname">Last name:</label>

  <input type="text" id="lname" name="lname"><br><br>

  <label for="email">Email:</label>

  <input type="email" id="email" name="email" autocomplete="off"><br><br>

  <input type="submit" value="Submit">

</form>